<template>
  <view>
    <!-- 搜索组件 -->
    <my-search @myClick="gotoSearch"></my-search>
    
    <view class="scroll-view-container">
      <!-- 左侧滚动视图区域 -->
      <scroll-view
        class="left-scroll-view"
        scroll-y
        :style="{ height: height + 'px' }"
      >
        <block v-for="(item, index) in cateList" :key="index">
          <view
            :class="['left-scroll-view-item', index === active ? 'active' : '']"
            @click="activeChange(index)"
            >{{ item.cat_name }}</view
          >
        </block>
      </scroll-view>
      <!-- 右侧滚动视图区域 -->
      <scroll-view
        class="right-scroll-view"
        scroll-y
        :style="{ height: height + 'px' }"
        :scroll-top="scrollTop"
      >
        <view class="cate-lv2" v-for="(item, index) in cateLeve" :key="index">
          <view class="cate-lv2-title">/ {{ item.cat_name }} /</view>
          <!-- 动态渲染三级分类的列表数据 -->
          <view class="cate-lv3-list">
            <!-- 三级分类 Item 项 -->
            <view
              class="cate-lv3-item"
              v-for="(item, index) in item.children"
              :key="index"
              @click="gotoGoodsList(item)"
            >
              <!-- 图片 -->
              <image :src="item.cat_icon" mode="widthFix"></image>
              <!-- 文本 -->
              <text>{{ item.cat_name }}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      cateLeve: [],
      height: 0,
      active: 0,
      scrollTop: 0
    }
  },
  onLoad() {
    this.getCateList()
    const { windowHeight } = uni.getSystemInfoSync()
    this.height = windowHeight - 50 
  },
  methods: {
    async getCateList() {
      const { data } = await uni.$http.get("/categories")
      if (data.meta.status !== 200) return uni.$showMsg()
      this.cateList = data.message
      this.cateLeve = data.message[0].children
    },
    activeChange(index) {
      this.active = index
      this.cateLeve = this.cateList[index].children
      this.scrollTop = this.scrollTop === 0 ? 1 : 0
    },
    gotoGoodsList(item) {
      uni.navigateTo({
        url: "/subpkg/goods_list/goods_list?cid=" + item.cat_id
      })
    },
    gotoSearch(){
      uni.navigateTo({
        url: '/subpkg/search/search'
      })
    }
  }
}
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      text-align: center;
      font-size: 12px;
      line-height: 60px;
      background-color: #f7f7f7;
      &.active {
        background-color: #fff;
        position: relative;
        &::before {
          content: "";
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item {
        width: 33.33%;
        margin-bottom: 10px;
        display: flex;
        flex-direction: column;
        align-items: center;
        image {
          width: 60px;
          height: 60px;
        }
        text {
          font-size: 12px;
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    image {
      width: 60px;
      height: 60px;
    }
    text {
      font-size: 12px;
    }
  }
}
</style>
